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139165-12-1

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139165-12-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 139165-12-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,1,6 and 5 respectively; the second part has 2 digits, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 139165-12:
(8*1)+(7*3)+(6*9)+(5*1)+(4*6)+(3*5)+(2*1)+(1*2)=131
131 % 10 = 1
So 139165-12-1 is a valid CAS Registry Number.

139165-12-1Upstream product

139165-12-1Relevant articles and documents

Enantioselective synthesis of the carbacephem antibiotic loracarbef via Mitsunobu and Dieckmann cyclization from an unnatural amino acid

Misner, Jerry W.,Fisher, Jack W.,Gardner, John P.,Pedersen, Steve W.,Trinkle, Kristina L.,Jackson, Billy G.,Zhang, Tony Y.

, p. 5991 - 5993 (2007/10/03)

The nucleus of the carbacephem antibiotic loracarbef was synthesized in a highly efficient and enantioselective fashion from 2S,3S-2-amino-3-hydroxy-6-heptenoic acid (AHHA), which was derived from enzyme-catalyzed condensation of glycine and 4-pentenaldehyde. The bicyclic framework of this compound was established through sequential Mitsunobu reaction and aldol condensations.

Scope of phthalimido chemistry I. Extension of utility by conversion to the opcb protecting group

Astleford, Bret,Weigel, Leland O.

, p. 3301 - 3304 (2007/10/02)

The scope of the phthalimido protecting group (PhthN-) is extended by reaction with pyrrolidine. The resulting o-pyrrolidinocarbonylbenzamide ("OPCB-") represents a base/nucleophile stable derivative of the parent, which reverts to the imide form upon treatment with acid. This methodology allows utilization of this protecting group (as the OPCB form in synthetic sequences requiring basic/nucleophilic reaction conditions.

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